CaO계 슬래그의 기화탈황 거동

• Published in: 대한금속·재료학회지, 45(4) Vol. 45; no. 4; pp. 243 - 250
• Main Authors: 박종민, Jong Min Park, 반봉찬, Bong Chan Ban, 김광천, Kwang Chun Kim, 전상호, Sang Ho Chun, 최현규, Hyun Kue Choi, 금창훈, Chang Hun Geum
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 22.04.2007; 대한금속·재료학회
• Subjects: BOF slag; desulfurization; recycling of iron oxide dust; sulfate reduction; 재료공학
• ISSN: 1738-8228; 2288-8241

The desulfurized slag during hot metal pretreatment station has lots of calcium sulfide, and iron oxide dust generated during oxygen blowing from the BOF contains high contents of iron and calcium sulfate. The calcium sulfide in the desulfurized slag and calcium sulfate in the CBP(cold bonded pellet) are the main source of sulfur reversal in the converter process. The behaviors of calcium sulfate and sulfide have been studied by the use of 50kg high frequency induction furnace, and the actual plant tests were carried at the BOF. The results show that evaporation of decomposed sulfate increases with increasing oxygen content in the slag with low carbon metal. In the case of ladle slag, desulfurization ratio is higher than 98% with blowing mixture gas which has more than 10% oxygen. The desulfurization time is shorter as the oxygen content in the blown gas increases. As above result, sulfur contents in the molten steel and slag can be controlled efficiently by oxygen blowing in slag